Buchholz describes Acmopyle alba, among other characters, that the pollen cones are larger 18-20 mm long by 3 mm in diameter, in contrast to Acmopyle pancheri 10-20 mm long by 2.3 mm in diameter. The smallest pollen cones were found on Mt. Mou and the largest ones somewhere else. No other differences were observed and therefore Acmopyle alba is no longer considered a separate species (de Laubenfels 1972).

Description

Tree reaching 5-25 m in height. Bark hard, smooth, brownish and fibrous inside, becoming gray with age and scales brake off of old trees. Adult leaves, flattened, bilateral, decurrent, distichuous, linear and spreading away from the branches at a 60-75° angle, having at the beginning 2 glaucuous bands of stomatas on either side of the leaf but disappearing on the upper leaf surface during leaf development, midrib is distinct with a weak line on the upper leaf surface and much more pronounced on the lower leaf surface. The leaves are very short at the beginning with the leafy shoots hardly producing a second cycle of leaves but continue to grow normally on the fertile shoots. Shaded leaves spread themselves out flat, 16-22 mm long by 2.8-3 mm wide, with slightly curved margins. Leaves exposed to the sun are less regular with a well formed carina, often wild and weakly spreading out, 10-15 mm long by 1.8-2.2 mm wide with the occasional intermediate leaf form. The other leaves are reduced to scales, triangular, flat, bifacial, streamlined on the back, 2 mm long, very dense around the base of fertile shoots. Pollen cone terminal, 10-20 mm long by 2.3 mm in diameter, often in pairs, one of the two is lateral, borne on the tip of a leafy shoot or a scaly shoot and accompanied by very small scales at the base. Microsporophylls small and triangular. Seed cone terminal or lateral on the tip of a leafy shoot, on a secondary shoot or a scaly shoot or on all of them at the same time. The seed cone is carried on a peduncle 9-22 mm long densely covered in small scales and formed on a fleshy, verrucose receptacle 8-18 mm long with 4-8 bracts. A single inclined ovule (Mill et al., 2001), projects safely from the epimatium which covers the axil of the bract subapical, becoming erect and fleshy. The epimatium completely melts with the ripe ovule and is attached to it by almost the half of the length and forms a light beard on the ridge of the fruit. Seed globular 10-11 mm in diameter without any fleshy part, thick and hard, distinct with a rough surface and the side joining the epimatium (de Laubenfels 1972).

Distribution and Ecology

New Caledonia (Farjon 1998). Acmopyle pancheri is dispersed in the ombrophilous, humid forests throughout the main island from sea level to 1200 m above sea level (mean elevation 566 m). Within its range, mean annual temperature is 20.0°C, with an average minimum in the coldest month of 13°C, and a mean annual precipitation of 1792 mm (Biffin et al. 2011, Table S5). It is a dominant tree in very wet soils (de Laubenfels 1972). The IUCN reports that the population status is unknown.